768 



Piroplasmosis of Cattle. 



by Lignieres for the European and Argentine piroplasmosis, by Theiler 

 for the English and South African redwater; (on the other hand, cattle 

 from Texas and from Queensland were immune against the South 

 African redwater). 



Lignieres describes a special species, the piroplasma Argentinum, 

 which is considerably smaller, usually only found singly in the erythro- 

 cytes, and produces in Argentine, Uruguay and Paraguay, an atypical 

 form of Piroplasmosis, which is frequently characterized by a protracted 

 and fatal course, and by nervous symptoms. 



Fig. 132. Ixodes reduvius. 1. eggs; 2. larvae; 3. nymph, several days old; 

 4. sexually mature female; 5. male. Enlarged 16 times. (After Kossel, Schiitz, 

 Weber & Miessner.) 



The parasites of East African coast fever, and of tropical piro- 

 plasmosis represent a decidedly independent species (see p. 779 and 

 p. 782). 



Development of the Ticks. The Boophilus annulatus (Margaropus 

 s. Rhipicephalus annulatus, Boophilus bovis) transmits, according to the 

 investigations of Smith & Kilborne, the infection in the following way: 



